From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 39ABA335BB1 for ; Thu, 16 Oct 2025 12:54:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760619252; cv=none; b=JbRzZAJmrWg96HEQa3G3KfhOCB1FvIgGBclGr7BTcNDX3odJsNwGSOGjunQ1rghffwQfUCVfFuT9BBEBV/ArdyMEcn2/GMWDdurewz+Nln/iJyiECudqqJlgbjoRryqDEG25rcgoWEIX6zvzrSIYa+D6EdJ9YzjKtymJnVhlBhs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760619252; c=relaxed/simple; bh=dlhgVTWY4WQ7of2/9/pxv8Isq1S9vDpTVyUH3Mkcc98=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=ty4DDfPr4qyha1tIou4sf8ulYoGAxKljKDO6ygm5Vsv4hddnLowWycgeKg+JtJKR17ZTsAQSYFTwLieTx4Qk4QmvZVg5zGXjPkbgIfuMiC/Xn3h9XY5GiLxUPY4mq+61X2Bjslvs5D8oqN4pLuV/DZ1c03w8PlujfPTWUSn7/b0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=pS7CJ/76; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="pS7CJ/76" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5328DC4CEFE; Thu, 16 Oct 2025 12:54:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760619249; bh=dlhgVTWY4WQ7of2/9/pxv8Isq1S9vDpTVyUH3Mkcc98=; h=Subject:To:Cc:From:Date:From; b=pS7CJ/76Y8vF6F9ljtakcZZFfmzh6RkA+nc/YCsW/Chdl2EuFJ1Necnz+zYnr0Y4E xZg5TYVHcapoMlhuGl5vdX0iLZzJZWi1li5ToSDcUfyH0iM02T9p6bRzgtQA4Ky5Kb XMG2xbVTQFurvaAjS5FdLbjoN3+ZgKfTwiHn5/FQ= Subject: FAILED: patch "[PATCH] xtensa: simdisk: add input size check in proc_write_simdisk" failed to apply to 5.15-stable tree To: linmq006@gmail.com,jcmvbkbc@gmail.com Cc: From: Date: Thu, 16 Oct 2025 14:54:06 +0200 Message-ID: <2025101606-wildfire-moody-50d8@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 5d5f08fd0cd970184376bee07d59f635c8403f63 # git commit -s git send-email --to '' --in-reply-to '2025101606-wildfire-moody-50d8@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 5d5f08fd0cd970184376bee07d59f635c8403f63 Mon Sep 17 00:00:00 2001 From: Miaoqian Lin Date: Fri, 29 Aug 2025 16:30:15 +0800 Subject: [PATCH] xtensa: simdisk: add input size check in proc_write_simdisk A malicious user could pass an arbitrarily bad value to memdup_user_nul(), potentially causing kernel crash. This follows the same pattern as commit ee76746387f6 ("netdevsim: prevent bad user input in nsim_dev_health_break_write()") Fixes: b6c7e873daf7 ("xtensa: ISS: add host file-based simulated disk") Fixes: 16e5c1fc3604 ("convert a bunch of open-coded instances of memdup_user_nul()") Cc: stable@vger.kernel.org Signed-off-by: Miaoqian Lin Message-Id: <20250829083015.1992751-1-linmq006@gmail.com> Signed-off-by: Max Filippov diff --git a/arch/xtensa/platforms/iss/simdisk.c b/arch/xtensa/platforms/iss/simdisk.c index 6ed009318d24..3cafc8feddee 100644 --- a/arch/xtensa/platforms/iss/simdisk.c +++ b/arch/xtensa/platforms/iss/simdisk.c @@ -231,10 +231,14 @@ static ssize_t proc_read_simdisk(struct file *file, char __user *buf, static ssize_t proc_write_simdisk(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - char *tmp = memdup_user_nul(buf, count); + char *tmp; struct simdisk *dev = pde_data(file_inode(file)); int err; + if (count == 0 || count > PAGE_SIZE) + return -EINVAL; + + tmp = memdup_user_nul(buf, count); if (IS_ERR(tmp)) return PTR_ERR(tmp);